const User = require('../../models/user')
const ERROR_MESSAGES = require('../../models/constant').ERROR_MESSAGES
const RESPONSE_STATUS = require('../../models/constant').RESPONSE_STATUS
const helper = require('../../helpers/helper')
const validator = require('validator')

module.exports.register = function(req, res) {
    const email = req.body.email
    const password = req.body.password
    const errors = []

    // input validation
    if (!email || email.trim().length == 0) {
        errors.push(ERROR_MESSAGES.EMPTY.EMAIL)
    } else if (!validator.isEmail(email)) {
        errors.push(ERROR_MESSAGES.INVALID.EMAIL)
    }

    if (!password) {
        errors.push(ERROR_MESSAGES.EMPTY.PASSWORD)
    }

    if (errors.length > 0) {
        return res.json(helper.generateResponse(errors, null, RESPONSE_STATUS.REQUEST_DENIED))
    } else {
        User.findOne({email: email}, function(err, user){
            if (err) {
                res.json(helper.generateResponse([ERROR_MESSAGES.UNKNOW], null, RESPONSE_STATUS.REQUEST_DENIED))
            } else if (user) {
                res.json(helper.generateResponse([ERROR_MESSAGES.DUPLICATE.EMAIL], null, RESPONSE_STATUS.REQUEST_DENIED))
            } else {
                var user = new User()
                user.email = email
                user.password = user.generateHash(password)

                var errorValidation = user.validateSync();

                if (errorValidation) {
                    // input validation
                    errors = helper.getMongooseValidationErrors(errorValidation.errors)
                    res.json(helper.generateResponse(errors, null, RESPONSE_STATUS.REQUEST_DENIED))
                } else {
                    user.save(function(error, newUser) {
                        if (error) {
                            res.json(helper.generateResponse([error], null, RESPONSE_STATUS.REQUEST_DENIED))
                        } else {
                            res.json(helper.generateResponse(errors, newUser, RESPONSE_STATUS.SUCCESS))
                        }
                    })
                }
            }
        })
    }
}